1 - Change resolution:
Go to OpenCore-Catalina and find for
cd OSX-KVM/OpenCore-Catalina grep 1920 *
Change resolutions to something like
Finally, change at Mac OS the resolution to what you want.
2 - Avoid freezing after a while when inactive
2.1 - Disable Screensaver
2.2 - At System Preferences, go to Energy Saver and set it to never Turn Off display. Then make sure you have enabled only the option: "Preventing the computer from sleeping ....."
3 - Super Key (Windows key) not behaving as mac Command key.
At qemu window, click on View, then enable "Grab On Hover"
4 - Create Snapshot
qemu-img create -F qcow2 -b mac_hdd_ng.img mac_hdd_ng_1.img
Update OpenCore-Boot.sh to call the new img file